Smoke test with real template

[ArchibaldBienetre]

Implements https://github.com/SergelsOrg/csv2tex/issues/72

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• [x] Wait for merge of https://github.com/SergelsOrg/csv2tex/pull/73
• [x] Rebase onto main

[ArchibaldBienetre]

I'll add the tests for the image file name filter as a separate step.

There are more test coverage issues to fix, after all.

https://github.com/SergelsOrg/csv2tex/issues/77